Develop
The closest synonym for the word improving is better.
prefered, fancied
healed, improved, on the mend
improve, better, increase, lift, boost, reinforce
There are several words meaning "make better" in different contexts, including mend, emend, ameliorate, improve and cure.
To improve.
Develop
To improve something
Better
The closest synonym for the word improving is better.
Gradually reach or cause to reach a larger and larger area or more and more people.
To get better
feel better
No, act is not a synonym for tax. Add may be a better word.
It could make it better, but nost likely make it worse.
prefered, fancied